TL;DR:
* We have upgraded the version of jQuery in MediaWiki from 1.8.x to 1.11.x.
* For a few months, a hack will keep old users scripts, gadgets etc. working.
* The hack will be removed around September when MediaWiki 1.24 is released.
* Before it is removed, make sure your wiki reviews any scripts and gadgets.
After a long time, we are finally upgrading the jQuery package that ships with
MediaWiki, and so is used by many extensions, gadgets and site and user scripts.
This upgrade fixes a lot of bugs, but also cleans up a lot of deprecated and
dubious functionality from early versions of jQuery.
Code which uses the removed functionality is currently working due to a short-
term hack, jQuery Migrate, that provides the removed functionality and outputs
a warning to the console log whenever it is activated.
The jQuery Migrate hack will be removed in the (Northern Hemisphere's) Autumn of
2014. This means all extensions, gadgets, and user & site scripts on your wikis
that still make use of jQuery legacy APIs will need to be upgraded before then
or they will break.
== What can I do? ==
If you are a developer, please follow the instructions in the posts to wikitech-l
about how to check and upgrade your wiki's gadgets, site and user scripts [0] [1].
If your wiki uses copies of other wikis' gadgets, please make sure that your wiki
is using the latest version. There is also a tracking bug for all the extensions
deployed on Wikimedia wikis which use the old code, which will be fixed before
the support hack is switched off. [2]
If you are not a developer, you can check your browser's console log to see if
there are any warnings tagged "JQMIGRATE". If you find any, please raise them in
your community so you can work together to make sure they are addressed in time.
If you are a wikiambassador, please make sure your community is aware of this
change and that any developers, gadget authors or script experts who write code
for your wiki know that this is coming and are working to fix any issues. If your
community is unable to fix any issues you have, please ask for help on this list
so that we can assist you.
Yours,
--
James D. Forrester
Product Manager, VisualEditor
Wikimedia Foundation, Inc.
jforrester@wikimedia.org | @jdforrester